O/D is gone

[jakerot]

Hello everyone.........want to say thanks first and foremost, since all of you have helped me sava a buck or 2 in the past........this site is great!!

Anyway, just wanted to throw my latest explorer problem at y'all to see what you think.

Recently at highway speeds my tranny wont kick into O/D. When driving around 55-60, if i let off the gas and then apply gas again, the transmisson does not engage and the rpm's rev. after breaking and slowing down it will enage again. When I put the truck in D (no O/D), I dont notice the reving at highway speeds and the truck drives OK (at least thats what I am trying to tell myself).

The truck drives OK around the town, no slipping and pretty good aceleration (at least for an Explorer).

I remember hearing a loud bang from the rear one time a little while ago when giving the truck gas while on the highway. I am guessing that bang was my OD gear getting destroyed.

My truck is a 1992, 150k miles, already had a tranny rebuild 2 years ago, had my tranny fluid changed at juffy lube about 3 months ago (not just from the basepan).

So I am pretty much asking if my O/D is indeed shot, and if I can still drive the car around town, and limited highway usage.

thanks all for your help!!!!

Best Regards,

Jakerot

 

[outrun84]

hmmmm

My old 91 Explorer would do something similiar but from first to second and third to fourth. It could be a servo is is a rubber part inside the transmission. I was told i needed an entire new tranny but a local transmission shop knew what it was and saved me about a thousand bucks. It is a fix a shop can do for about $200 Might be the problem. But i duno. Leme know how ya make out

 

[MrShorty]

With a no OD problem, I like to recommend that you start by determining if it's external to the transmission or internal to the transmission. A broken wire in the OD solenoid circuit would cause a no OD condition that would be cheap and easy to fix. Bad data from a TPS or VSS would cause the computer to not shift the transmission into OD. I would make sure the computer control portion of the OD is working before blaming it on something internal to the transmission.

 

[jakerot]

outrun84......OK thanks for the reply, i will have it checked out

Mr Shorty......thank you also for your reply......I have though about my problem bieng external to the transmission, however I have ruled this out due to 2 factors (1) the fact that before this started happening, i was driving at highway speeds and heard a very loud "bang" come from under my truck while applying the gas and (2) the fact that when the transmission is in O/D mode, the rpm's rev high when at highway speeds, as if the truck was in neutural. I confirmed it again, that when the truck is NOT in O/D mode, there is no slipping or reving. Yesterday while driving at 60mph with the O.D off, i put the transmission in O/D on and when I applied the gas the rpm's raced to 5k or so before i let off the gas. the transmission was not engaged at all. this leads me to belive that the loud bang i heard was my O/D gear(s) getting stripped.

Oh well.........

thanks again